This meaning is somehow inverse to the meaning in the group theory. The axis (where present) and the plane of a rotation are orthogonal.Ī representation of rotations is a particular formalism, either algebraic or geometric, used to parametrize a rotation map. Unlike the axis, its points are not fixed themselves. The plane of rotation is a plane that is invariant under the rotation.The axis of rotation is a line of its fixed points.The rotation group is a point stabilizer in a broader group of (orientation-preserving) motions. This (common) fixed point or center is called the center of rotation and is usually identified with the origin. The rotation group is a Lie group of rotations about a fixed point. These two types of rotation are called active and passive transformations.
For example, in two dimensions rotating a body clockwise about a point keeping the axes fixed is equivalent to rotating the axes counterclockwise about the same point while the body is kept fixed. But in mechanics and, more generally, in physics, this concept is frequently understood as a coordinate transformation (importantly, a transformation of an orthonormal basis), because for any motion of a body there is an inverse transformation which if applied to the frame of reference results in the body being at the same coordinates. All rotations about a fixed point form a group under composition called the rotation group (of a particular space). Rotation can have a sign (as in the sign of an angle): a clockwise rotation is a negative magnitude so a counterclockwise turn has a positive magnitude.Ī rotation is different from other types of motions: translations, which have no fixed points, and (hyperplane) reflections, each of them having an entire ( n − 1)-dimensional flat of fixed points in a n- dimensional space. It can describe, for example, the motion of a rigid body around a fixed point. Any rotation is a motion of a certain space that preserves at least one point. Rotation in mathematics is a concept originating in geometry. Rotation of an object in two dimensions around a point O. JSTOR ( February 2014) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Rotation" mathematics – news Please help improve this article by adding citations to reliable sources. Common rotation angles are \(90^\) anti-clockwise : (-6.This article needs additional citations for verification. Rotation can be done in both directions like clockwise and anti-clockwise. As a convention, we denote the anti-clockwise rotation as a positive angle and clockwise rotation as a negative angle. The amount of rotation is in terms of the angle of rotation and is measured in degrees. The point about which the object is rotating, maybe inside the object or anywhere outside it. The direction of rotation may be clockwise or anticlockwise. Thus A rotation is a transformation in which the body is rotated about a fixed point. In the mathematical term rotation axis in two dimensions is a mapping from the XY-Cartesian point system. The rotation transformation is about turning a figure along with the given point. The point about which the object rotates is the rotation about a point.
The rotations around the X, Y and Z axes are termed as the principal rotations. In three-dimensional shapes, the objects can rotate about an infinite number of imaginary lines known as rotation axis or axis of motion. It is possible to rotate many shapes by the angle around the centre point. Rotation means the circular movement of somebody around a given centre. Thus, in Physics, the general laws of motions are also applicable for the rotational motions with their equations. But, many of the equations for the mechanics of the rotating body are similar to the linear motion equations. Rotational motion is more complex in comparison to linear motion. Such motions are also termed as rotational motion. Also, the rotation of the body about the fixed point in the space. The motion of some rigid body which takes place so that all of its particles move in the circles about an axis with a common velocity.
This article will give the very fundamental concept about the Rotation and its related terms and rules. In geometry, four basic types of transformations are Rotation, Reflection, Translation, and Resizing. In our real-life, we all know that earth rotates on its own axis, which is a natural rotational motion. It is applicable for the rotational or circular motion of some object around the centre or some axis. The term rotation is common in Maths as well as in science.